lint: add no-unused-vars ignore to test files

Author: CortexPrism

test/unit/mod.test.ts

@@ -1,4 +1,4 @@
-// deno-lint-ignore-file require-await
+// deno-lint-ignore-file require-await, no-unused-vars
 import { assertEquals } from 'https://deno.land/std@0.208.0/assert/mod.ts';
 import { tools } from '../../mod.ts';
 import type { PluginContext } from 'cortex/plugins';